I am completely new here, and this is my first message here.
So if I do something… What is not allowed or something else should… Tell me, so I can learn from it.
About three months ago my Victron home battery started working.
I installed it myself. And that was actually surprisingly simple.
Now I am trained as an electrician, so that already helps for the knowledge.
Nevertheless, I made a considerable study of the Victron systems before the installation.
And that has resulted in a nice, well-functioning installation.
The installation consists of: 1x Multiplus II 5000 + serbo GX + 10 KW Voltsmile battery.
The installation runs on the DESS software.
And that also works very well.
Although I do notice one thing about the behavior of DESS. (green mode)
And that is also my question.
As can be seen in the images below.
The system starts the return of the stored solar energy just after the peak.
So the system actually starts an hour too late.
The peak is often around 8 p.m. Then the system starts the return at 9 p.m.
And I find that very strange. I won’t get poor from it… But it’s not a tip top earning model either.
This has been more the rule than the exception since the beginning of April (I switched to a different energy contract). Sometimes it goes well. But usually the system is just an hour too late.
Mine starts approx 20-24minutes late, so it miss minimum 20minutes of ie infeed at a higher rate.
Have not used dess much since it do not fit our differentiated buying prices in Denmark, so have no clue why it is delayed.
I just went live with my Dynamic ESS in the Netherlands (3x MPII 5000VA, MPPT RS 450/200, 64kW Battery Bank) and I see the same behavior. Did anyone figure this out yet?
Thank you for the question and thank you to anyone sharing some insights.
No, unfortunately, no one is responding with a solution.
I do notice that sometimes it works out fine, and everything happens on time. But often it doesn’t.
It’s a strange problem, because I hear from others that they don’t have this problem at all.
So I don’t really know where to look…
Make sure you set the correct maximum import and export power, DESS uses this to determine when it should start charging/discharging to get to the target SOC.
Yes, I checked that.
The problem isn’t so much that it miscalculated how long it takes to reach a soc.
It’s more that the energy price peaks at, say, 8 PM. And my system won’t start delivering until 9 PM.
Well, I noticed that too.
Various information wasn’t loading correctly.
And the website was very slow.
But the problem this post is about… Unfortunately, it’s been around for a while.
And actually, it’s been around since I started this system in February.
Okay, a few months ago, I tried resetting the data. I don’t think it helped then.
But maybe I can try again. I’ll wait until the VRM is working properly again. The VRM is completely dead right now.
I just manually took over DESS. Whatever, that’s not working properly today. But that’s definitely related to the VRM issues…
Latest stable is working perfect for me, current DESS problems seem to be related to the database issues. My advice, check if you are running the latest stable version and check if that solves it (when the database is back up)
I assume you mean the Venus OS version…
Yes, I’m running the latest version, which isn’t a problem.
The problem I’m experiencing has everything to do with DESS.
And (unfortunately) DESS isn’t running locally yet, but mostly on Victron’s servers.
Well, the database problems of the past few days… are, of course, a separate issue from what’s being discussed in this thread.
The problem discussed has also existed longer than the database problems.
Let’s hope the database problems are resolved soon.
The way I see it, green mode DESS only discharges in hours with no expected PV generation. And this makes sense to me.
Rationale: it only sells the excess and you cannot figure out the excess before the solar charging of the day is done.
I admit that solar charging ending at maybe 20:05 and only selling back at 21:00 feels stupid, but logically it makes sense. The switch to 15min prices will make this behave better.
Went back to the top (12 may) to check if I missed something, and I did “green mode”. So that explains some of it.
When I was still running green mode I also had those problems. That was with an old OS version and not tried it with the current way better newer versions.
But my biggest issue with green mode then was the unreliable weather forecast and target SoC with not enough solar because of it.
I have a similar issue in the UK (daylight saving). The fixed price schedule is 1 hour adrift to the correct daily.adjusted time) . I have to manually adjust the schedule to get the correct tarrif setup to work
